package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@RestController
@Slf4j
@RequestMapping("/dish")
public class DishController {

    @Autowired
    private DishService dishService;
    @Autowired
    private DishFlavorService dishFlavorService;
    @Autowired
    private CategoryService categoryService;
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto)
    {
        log.info("菜品信息为: {}", dishDto.toString());
        dishService.saveWithFlavor(dishDto);

        // 清理所有菜品的缓存数据
        // Set keys = redisTemplate.keys("dish_*");
        // redisTemplate.delete(keys);

        // 清理某个分类下的菜品缓存数据
        String key = "dish_"+dishDto.getCategoryId()+"_1";
        redisTemplate.delete(key);
        return R.success("新增菜品成功");
    }

    /**
     * 菜品信息分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name)
    {
        log.info("page={}, pageSize={}, name={}", page, pageSize, name);

        Page pageInfo = new Page(page, pageSize);
        Page dishDtoPage = new Page<>();

        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.like(name != null, Dish::getName, name);
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        dishService.page(pageInfo, queryWrapper);

        BeanUtils.copyProperties(pageInfo, dishDtoPage, "records");

        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map( (item)->{

            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item, dishDto);

            // 分类id
            Long categoryId = item.getCategoryId();
            // 分类对象
            Category category = categoryService.getById(categoryId);
            if(category != null) {
                // 分类名称
                String categoryName = category.getName();

                dishDto.setCategoryName(categoryName);
            }
            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);
        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> getById(@PathVariable Long id)
    {
        log.info("菜品的id为: {}", id);
        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }

    /**
     * 修改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto)
    {
        log.info("菜品信息为: {}", dishDto.toString());
        dishService.upateWithFlavor(dishDto);

        // 清理所有菜品的缓存数据
        // Set keys = redisTemplate.keys("dish_*");
        // redisTemplate.delete(keys);

        // 清理某个分类下的菜品缓存数据
        String key = "dish_"+dishDto.getCategoryId()+"_1";
        redisTemplate.delete(key);

        return R.success("修改菜品成功");
    }

    /**
     * 修改菜品售卖状态
     * @param ids
     * @param status
     * @return
     */
    @PostMapping("/status/{status}")
    public R<String> updateStatus(@RequestParam List<Long> ids,@PathVariable int status)
    {
        log.info("id: {}, status: {}", ids, status);
        LambdaUpdateWrapper<Dish> updateWrapper = new LambdaUpdateWrapper<>();
        updateWrapper.in(Dish::getId, ids);
        updateWrapper.set(Dish::getStatus, status);
        dishService.update(updateWrapper);
        return R.success("修改菜品售卖状态成功");
    }

    /**
     * 删除菜品
     * @param ids
     * @return
     */
    @DeleteMapping
    public R<String> delete(@RequestParam List<Long> ids)
    {
        log.info("ids: {}", ids);
        dishService.removeWithFlavor(ids);
        return R.success("删除菜品成功");
    }

    /**
     * 根据条件查询菜品数据
     * @param dish
     * @return
     */
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish)
    {
        List<DishDto> dishDtoList = null;
        // 动态构造key
        String key = "dish_"+dish.getCategoryId()+"_"+dish.getStatus();

        // 先从redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);
        if(dishDtoList != null){
            // 如果存在, 直接返回, 无需查询数据库
            return R.success(dishDtoList);
        }

        // 构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        // 查询该分类的菜品
        queryWrapper.eq(dish.getCategoryId()!=null, Dish::getCategoryId, dish.getCategoryId());
        // 根据name查询菜品
        queryWrapper.like(dish.getName()!=null, Dish::getName, dish.getName());
        // 查询状态为1(起售状态)的菜品
        queryWrapper.eq(Dish::getStatus, 1);

        // 添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);
        // 查询数据
        List<Dish> dishList = dishService.list(queryWrapper);

        dishDtoList = dishList.stream().map((item)->{
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item, dishDto);

            // 获取菜品id
            Long id = item.getId();

            // 在菜品口味表中查询口味
            LambdaQueryWrapper<DishFlavor> dishFlavorLambdaQueryWrapper = new LambdaQueryWrapper<>();
            dishFlavorLambdaQueryWrapper.eq(DishFlavor::getDishId, id);

            List<DishFlavor> dishFlavorList = dishFlavorService.list(dishFlavorLambdaQueryWrapper);

            dishDto.setFlavors(dishFlavorList);
            return dishDto;
        }).collect(Collectors.toList());

        // 将查询到的菜品数据缓存到redis
        redisTemplate.opsForValue().set(key, dishDtoList);
        return R.success(dishDtoList);
    }
}
